Air-cushion for rubber stamps.



. G. G. GIBSON.

AIR CUSHION FOR RUBBER STAMPS.

APPLICATION FILED JAN. 23, 1914.

1 1 03,670, I Patented July 14, 1914.

7451 711 55661 coy/DAM I TMAMM CALDER C. GIBSON, OF BUFFALO, NEW YORK.

AIR-CUSHION FOR RUBBER STAMPS.

Specification of Letters Patent.

Patented July 14, 1914.

Application filed January 23, 1914. Serial No. 813,942.

To all whom it may concern:

Be it known that I, CALDER C. GIBSON, a citizen of the United States,residing at Buffalo, in the county of Erie and. State of New York, haveinvented certain new and useful Improvements in Air-Cushions for RubberStamps, of which the following is a specification.

This invention relates to printing and particularly to a stamp pad ofthe hand or machine type, it being the purpose of the inventor toutilize the cushion for the stamping devices forming the subject matterof this invention with restriction.

An object of the present invention is to produce a cushion for stampingmachines or devices having a plurality of air cells associated with ayieldable agent forming the said cells so that when the stamping deviceis used, benefit of the air cushion and yieldable material will result,so that pressure applied to the stamping device or that portion thereofcarrying the type, will be equalized over the printing surface, therebymaking the outline of the letters practically uniform.

A further object of this invention is to produce a type cushion formedin sheets with well defined joints between sections thereof, in orderthat a portion of the sheet may be removed coextensive with therequirements of use, each section being com-- plete and elfective forthe purpose of producing the air and yielding cushion heret fore stated,the said sheet of cushioningmterial being provided with doublepartitions at each joint rendering it possible to sever a sectiontherefrom in its completed stat? whereas the intermediate doublepartitions: act as air chambers when the cushion is cor. pressed.

It is furthermore an object of this invention to produce a pad of thecharacter noted having a series of longitudinally disposed ribs andtransversely disposed ribs extending between each pair of longitudinallydisposed ribs and transversely disposed ribs forming partitions, thealternate transverse partitions being of less height than thosetherebetween so that the applicability of the resultant structure isaugmented.

With the foregoing and other objects in view, the invention consists inthe details construction and in the arrangement and combination of partsto be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to theaccompanying drawings forming part of this specification wherein likecharacters denote corresponding parts in the several views in whichFigure 1 illustrates a view in perspective of a hand stamp with acushion embodyingthe invention applied thereto; Fig. 2 illus trates anunderneath plan view of the cushion; Fig. 3 illustrates a sectional viewon the line 33 of Fig. 2, a fragment of the said cushion only beingshown; and Fig. 4 illustrates a transverse sectional view on the line4-4 of Fig. 2.

In these drawings 5 denotes any appro priate base of a stamping deviceand as the base and parts associated therewith for its manipulation oroperation form no part of the subject matter of the present invention,it will not be described in detail. The pad has a plain outer surfaceformed by the outer wall 6 adapted to receive and support the type orletters 7 and as the manner of applying the letters or type to the padforms no part of the present invention, further detailed descriptionthereof is omitted.

The pad is preferably formed in large sheets so that an appropriatesized pad may be cut therefrom thus enabling the manufacturer of stampsto make the pad of the proper dimensions to suit particularrequirements. The outer wall 6 has formed therewith a series oflongitudinally disposed pairs of ribs 8, 8, the adjacent ribs of eachpair being closer together than the ribs of each pair are, when the wall6 is severed between the two adjacent ribs 8, and a pad in its completedstate is formed, it being observed from an inspection of Fig. 4 that thesaid longitudinally disposed ribs are slightly spaced apart and that anair cushion is formed between them when pressure is applied to thestamping apparatus.

There is a series of transversely disposed ribs integral with the outerwall 6 and with the longitudinally disposed ribs 9 and 10 between eachpair of longitudinally disposed ribs 8, the transversely disposed ribs 9being equal in height to the longitudinally disposed ribs 8, whereasthose ribs 10 intermediate the ribs 9 are of less height than the saidribs 9, which arrange ment produces a full pneumatic effect, whileadding to the flexibility of the cushion.

It is the purpose of the inventor to make the material for forming padsin sheets of tiori will enable those skilled in the art to "certainlength and it is obvious from an inspection of Fig. 4 that if thematerial shown therein were severed between any two of the adjacentlongitudinally disposed ribs 8, a complete pad would be formed ofreduced size as compared with the one shown in Fig. 4, yet the saidsevered portion would have all of the characteristics inherent in thelarger pad. 7

It is thought that the foregoing descripmanufacture the pads or toutilize the same and it is also thought that the advantages claim of thepatent.

I claim In a stampingdevice, a cushion compris-' wall between the lastmentioned ribs for producing a cushion of the required size,transversely disposed partitions between the longitudinally disposedribs of each pair, the alternate transversely disposed ribs be ing ofless height than the companion transversely disposed ribs. of theinvention will be apparent, it being Q understood that changes in theproportions and details of construction may be resorted towithoutd'eparting from the scope of the CALDER o. one so Witnesses:

'D. H. HARPER,

L. A. DEUTHER.

"copies a: isms isa'ten t may be obtained for five cents each, byaddressin the oominiss'ioner of iat'ents,

. Washington, D. 02f

